Source noise suppression in attosecond transient absorption spectroscopy by edge-pixel referencing

Abstract

Attosecond transient absorption spectroscopy (ATAS) is used to observe photoexcited dynamics with outstanding time resolution. The main experimental challenge of this technique is that high-harmonic generation sources show significant instabilities, resulting in sub-par sensitivity when compared to other techniques. This paper proposes edge-pixel referencing as a means to suppress this noise. Two approaches are introduced: the first is deterministic and uses a correlation analysis, while the second relies on singular value decomposition. Each method is demonstrated and quantified on a noisy measurement taken on WS2 and results in a fivefold increase in sensitivity. The combination of the two methods ensures the fidelity of the procedure and can be implemented on live data collection but also on existing datasets. The results show that edge-referencing methods bring the sensitivity of ATAS near the detector noise floor. An implementation of the post-processing code is provided to the reader.

Document Details

Document Type
Pub Defense Publication
Publication Date
Jan 05, 2021
Source ID
10.1364/oe.412117

Entities

People

  • Adam M Schwartzberg
  • Hugo J. B. Marroux
  • Hung-Tzu Chang
  • Romain Geneaux

Organizations

  • Agence Nationale de la Recherche
  • Air Force Office of Scientific Research
  • Marie SkÅ‚odowska-Curie Actions
  • United States Department of Energy
  • W. M. Keck Foundation

Tags

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Neural Network Machine Learning.
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.